J/MNRAS/448/484 MgII UV feature in T Tauri stars (Lopez-Martinez+, 2015)
Constraints to the magnetospheric properties of T Tauri stars.
II. The MgII ultraviolet feature.
Lopez-Martinez F., Gomez de Castro A.I.
<Mon. Not. R. Astron. Soc., 448, 484-501 (2015)>
=2015MNRAS.448..484L 2015MNRAS.448..484L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, pre-main sequence ; Ultraviolet ; Line Profiles
Keywords: line: profiles - stars: jets - stars: pre-main-sequence -
stars: variables: T Tauri, Herbig Ae/Be - stars: winds, outflows -
ultraviolet: stars
Abstract:
The atmospheric structure of T Tauri stars (TTSs) and its connection
with the large-scale outflow is poorly known. Neither the effect of
the magnetically mediated interaction between the star and the disc is
well understood. The MgII multiplet is a fundamental tracer of TTSs
atmospheres and outflows, and is the strongest feature in the
near-ultraviolet spectrum of TTSs. The International Ultraviolet
Explorer and Hubble Space Telescope data archives provide a
unique set to study the main physical compounds contributing to the
line profile and to derive the properties of the line formation
region. The MgII profiles of 44 TTSs with resolution 13000-30000 are
available in these archives. In this work, we use this data set to
measure the main observables: flux, broadening, asymmetry, terminal
velocity of the outflow, and the velocity of the discrete absorption
components. For some few sources repeated observations are available
and variability has been studied. There is a warm wind that at sub-au
scales absorbs the blue wing of the MgII profiles. The main result
found in this work is the correlation between the line broadening,
MgII flux, terminal velocity of the flow and accretion rate. Both
outflow and magnetospheric plasma contribute to the MgII flux. The
flux-flux correlation between MgII and CIV or HeII is confirmed;
however, no correlation is found between the MgII flux and the UV
continuum or the H2 emission.
Description:
The MgII profiles were extracted from the IUE and HST archives for
the log of observations shown in Table 1. We checked the archives for
all the available observations of the MgII profiles for TTSs with
resolutions between 13000 and 30000. Taking into account these
characteristics, we selected 126 observations of 44 TTSs the archives.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 85 43 Properties of the stars analysed in this work
table3.dat 106 110 MgII flux measurements corrected from extinction
and velocity measurements of the analysed profiles
table1.dat 72 126 Telescope/instrument details of the MgII
observations of the stars in the sample
tablea1.dat 55 111 Telescope/instrument details for the Ly-alpha
observations of the stars in the sample
refs.dat 72 39 References
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Star Star name
10 A1 --- n_Star [W] Note on Star (1)
12- 15 A4 --- SpType MK spectral type
17- 18 I2 --- r_SpType Reference for Spectral type,
in refs.dat file
20- 22 I3 pc Dist ?=- Distance
24- 25 I2 deg incl ?=- Inclination
26 A1 --- --- [-]
27- 28 I2 pc inclU ? Upper value of inclination when interval
30- 31 I2 --- r_incl ? Reference for Inclination,
in refs.dat file
33- 36 F4.2 mag AV ?=- Absorption in V band
38- 39 I2 --- r_AV ? Reference for Absorption,
in refs.dat file
41- 45 F5.2 10-8Msun/yr dM/dt ?=- Mass loss
47- 48 I2 --- r_dM/dt ? Reference for Mass loss,
in refs.dat file
50- 53 F4.1 km/s vsini ?=- Rotational velocity
55- 56 I2 --- r_vsini ? Reference for vsini, in refs.dat file
58- 61 F4.2 [K] logTeff ?=- Effective temperature
63- 64 I2 --- r_logTeff ? Reference for Effective temperature,
in refs.dat file
66- 70 F5.2 [Lsun] logL ?=- Luminosity
72- 73 I2 --- r_logL ? Reference for Luminosity,
in refs.dat file
75- 78 F4.1 Msun Mass ?=- Mass
79 A1 --- n_Mass [a] Note on Mass (1)
81- 84 F4.1 Myr Age ?=- Age
85 A1 --- n_Age [a] Note on Age (1)
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Note (1): Notes as follows:
W = WTTSs of the sample according to the references indicated in this table
a = Values taken from other authors because they could not be measured from
D'Antona & Mazzitelli (1997MmSAI..68..807D 1997MmSAI..68..807D) tracks.
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Star Star name
10- 19 A10 "date" Obs.date Observation date
21- 26 F6.2 10-15W/m2 F2796 Flux at 2796Å MgII line
28- 32 F5.2 10-15W/m2 e_F2796 rms uncertainty on F2796
34- 38 F5.2 10-15W/m2 F2804b Flux at 2804Å blue MgII line
40- 43 F4.2 10-15W/m2 e_F2804b rms uncertainty on F2804b
45- 49 F5.2 10-15W/m2 F2804r Flux at 2804Å red MgII line
51- 55 F5.2 10-15W/m2 e_F2804r rms uncertainty on F2804r
57- 62 F6.1 km/s Vterm ? Terminal velocity
63 A1 --- n_Vterm [*] *: Terminal velocity can be measured
accurately
65- 71 F7.2 km/s DAC ? First discrete absorption components
velocity
73- 78 F6.2 km/s DAC2 ? Second discrete absorption components
velocity
80-106 A27 --- Com Comments
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Byte-by-byte Description of file: table1.dat tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Star Name of the star
10- 17 A8 --- Inst Telescope/Instrument
19- 28 A10 "date" Obs.date Observation Date (yy-mm-dd)
30- 38 A9 --- IDobs Identification of the observation
41- 45 I5 --- R Resolving power
47- 55 F9.1 s ExpTime Exposure time
57- 61 F5.2 --- S/N ? Signal to noise ratio
63- 72 A10 --- n_S/N Note on S/N
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Ref Reference number
4- 22 A19 --- BibCode BibCode
24- 52 A29 --- Aut Author's name
54- 72 A19 --- Com Comments
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History:
From electronic version of the journal
References:
Lopez-Martinez & Gomez de Castro, Paper I 2014MNRAS.442.2951L 2014MNRAS.442.2951L
(End) Patricia Vannier [CDS] 04-Aug-2015